Turkish

Suffix

-siniz

1. Suffix of verb "to be" for subject "you" (formal or plural).

   Gerginsiniz.‎ ― You are nervous.

Usage notes

• It's used when the word's last vowel is one of "e" or "i".
• It could be "-sunuz", "-sünüz", "-sınız" according to the last vowel of the word.
• While talking about you (singular) or you (informal), it becomes "-sin"